I’ve utilized the FaxPro module multiple times but only with a PRI. I have a customer with SIP that is interested in the module. If I have SIP DIDs that are T.38 enabled will everything run as smoothly as it does with a PRI?
I have FaxPro and SIP DID, I send and receive faxes fine. I can not compare it to PRI. Not heavy fax use 10-20 pages/month.
Fax Pro works fine for me. Make sure your udptl ports are open.
Nothing will ever be as good as copper but t.38 works pretty reliably with the right providers and settings.